Need help reconfiguring my router/modem N600

[TrishaRam]

My modem was factory reset by mistake and I am unsure how to get it reconfigured. 

[antinode]

> [...] my router/modem N600

   Not a model number.  Look for "Model" on the product label.

   With that datum in hand, you might try this radical concept:

      https://en.wikipedia.org/wiki/RTFM

   Visit http://netgear.com/support , put in your (actual) model number,
and look for Documentation.  Get the User Manual (at least).  Read.

> [...] I am unsure how to get it reconfigured.

   Same here.  I don't even know what it is.  Or who/what your ISP is.
Or your type of service.  Or anything useful, really.

[michaelkenward]

Visit the support pages:

Support | NETGEAR

and feed in your model number and check the documentation for your hardware.

Look for the model number on the label on the device.

A good place to start is the Quick Start Guide for whatever it is that you own. It is the thing they stuff in the box the thing arrived in. With luck you  need to go to the hassle of reading the whole manual.